Tokyo, Japan - October 28, 1999 - Trend Micro, Inc. (NASDAQ: TMIC, Japan OTC: 4704) today announced that it will participate in a joint venture with 4 leading network security vendors designed to provide enterprises with comprehensive network security services. The new company - NTT Data Security Corporation - will be founded in November 1999.

NTT Data Security will be dedicated to providing comprehensive support services, tailored to customer requirements. Joint development efforts will create the basis to deliver highly flexible security solutions both through customized as well as completely new developmental efforts. This unique approach of integrating each vendor’s technology into the development process of information system security will be an industry first.

The initial capital of the new company will be approximately $3 million USD:

64% owned by NTT Data (JAPAN TSE: 9613)

20% by Trend Micro (NASDAQ: TMIC, Japan OTC: 4704)

10% by Hitachi (JAPAN TSE: 6501)

3% by Cisco Systems (NASDAQ: CSCO) subsidiary, Cisco Systems Japan

3% by S&T Consulting

"By bringing together the best available network security technology and expertise, NTT Data Security will aim to provide enterprise customers with the ultimate security solutions," said Steve Chang, Trend Micro's chairman and CEO.

The participants in the joint venture all have extensive network security expertise. System integrator NTT Data is active in network security services and will play a key role in the new company. Trend Micro will contribute its antivirus and Internet security expertise. Electronics vendor Hitachi will supply the standardization of information system security in areas such as PKI (public key infrastructure). Internet networking leader Cisco Systems will contribute its extensive networking know-how, including the management of secure routers and firewalls.

With the increased importance of information systems in corporate environments, coupled with the explosive growth of the Internet and B2B transactions, enterprise security systems have become indispensable.

Trend Micro's participation in this joint venture reflects its ongoing commitment to be the antivirus standard of the network security industry.

About NTT DATA

As Japan's largest system integrator, NTT DATA serves a pioneering role in the information services industry. Building computer network systems that demand high reliability nationwide, the company supports the basis of social and the economic activities. In the expanding corporate information communications field, NTT DATA backs corporate activities with its advanced system development capabilities. NTT DATA delivers optimal solutions with the development of state-of-the-art network systems and services in tune with the latest advancements in multimedia.

Notice Regarding Forward-Looking Statements

Forward-looking statements in this release include, but are not limited to, statements regarding the anticipated success of the NTT DATA Security joint venture, the level of network security and support services to be provided by the venture to enterprise customers, Trend Micro’s anticipated role in contributing to the venture’s success and Trend Micro’s commitment to become the antivirus standard for the network security industry. Such statements involve risks and uncertainties which could cause actual results to differ materially from those set forth in these statements. Among other things, successful implementation of the venture depends upon effective integration of the venture partners’ technologies as the venture develops information system security solutions, and effective marketing of those solutions to enterprise customers. In addition to these risks, the effectiveness of Trend Micro’s products in protecting against computer viruses, Trend Micro’s success in implementing an Internet service business model and other risks identified in the Risk Factors section of Trend Micro’s prospectus dated October 18, 1999 relating to the U.S option program of Trend Micro’s 1999 incentive plan could affect forwarding-looking statements in this press release. The prospectus is on file with the Securities and Exchange Commission. Trend Micro assumes no obligation to update this information.